swiftui - UIViewControllerRepresentable 和 CNContactPickerViewController

Question

似乎无法创建与 CNContactPickerViewController 一起使用的 UIViewControllerRepresentable。

使用 Xcode 11 beta 4，我使用其他 UIViewController 创建了许多其他 UIViewControllerRepresentable，并且这些都工作得很好。我尝试更改 CNContactPickerViewController 的功能和委托(delegate)的不同实现。

import SwiftUI
import ContactsUI

// Minimal version
struct LookupContactVCR : UIViewControllerRepresentable {

    func makeUIViewController(context: Context) -> CNContactPickerViewController {
        let contactPickerVC = CNContactPickerViewController()
        contactPickerVC.delegate = context.coordinator
        return contactPickerVC
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator()
    }

    func updateUIViewController(_ uiViewController: CNContactPickerViewController, context: Context) {}

    class Coordinator: NSObject {}
}

extension LookupContactVCR.Coordinator : CNContactPickerDelegate {

    func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {
        print("Chose: \(contact.givenName)")
    }
}

#if DEBUG
struct LookupContact_Previews : PreviewProvider {
    static var previews: some View {
        LookupContactVCR()
    }
}
#endif

没有错误消息。但屏幕始终是白色的，没有任何渲染。

Answer 1

首先，请针对此问题提交一份[Bug Report][1]。[1]:https://bugreport.apple.com

其次，此问题有2 个解决方法:

1. 您可以使用ABPeoplePickerNavigationController它已被弃用，但仍然有效。
2. 创建 UIViewController其中呈现 CNContactPickerViewController上viewWillAppear并将这个新创建的 View Controller 与SwiftUI一起使用.

1. ABPeoplePickerNavigationController

import SwiftUI
import AddressBookUI

struct PeoplePicker: UIViewControllerRepresentable {
    typealias UIViewControllerType = ABPeoplePickerNavigationController

    final class Coordinator: NSObject, ABPeoplePickerNavigationControllerDelegate, UINavigationControllerDelegate {
        func peoplePickerNavigationController(_ peoplePicker: ABPeoplePickerNavigationController, didSelectPerson person: ABRecord) {
            <#selected#>
        }
        
        func peoplePickerNavigationControllerDidCancel(_ peoplePicker: ABPeoplePickerNavigationController) {
            <#cancelled#>
        }
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator()
    }

    func makeUIViewController(context: UIViewControllerRepresentableContext<PeoplePicker>) -> PeoplePicker.UIViewControllerType {
        let result = UIViewControllerType()
        result.delegate = context.coordinator
        return result
    }
    
    func updateUIViewController(_ uiViewController: PeoplePicker.UIViewControllerType, context: UIViewControllerRepresentableContext<PeoplePicker>) { }

}

2. CNContactPickerViewController

嵌入式ContactPickerViewController

import Foundation
import ContactsUI
import Contacts

protocol EmbeddedContactPickerViewControllerDelegate: AnyObject {
    func embeddedContactPickerViewControllerDidCancel(_ viewController: EmbeddedContactPickerViewController)
    func embeddedContactPickerViewController(_ viewController: EmbeddedContactPickerViewController, didSelect contact: CNContact)
}

class EmbeddedContactPickerViewController: UIViewController, CNContactPickerDelegate {
    weak var delegate: EmbeddedContactPickerViewControllerDelegate?
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.open(animated: animated)
    }
    
    private func open(animated: Bool) {
        let viewController = CNContactPickerViewController()
        viewController.delegate = self
        self.present(viewController, animated: false)
    }
    
    func contactPickerDidCancel(_ picker: CNContactPickerViewController) {
        self.dismiss(animated: false) {
            self.delegate?.embeddedContactPickerViewControllerDidCancel(self)
        }
    }
    
    func contactPicker(_ picker: CNContactPickerViewController, didSelect contact: CNContact) {
        self.dismiss(animated: false) {
            self.delegate?.embeddedContactPickerViewController(self, didSelect: contact)
        }
    }
    
}

嵌入式联系人选择器

import SwiftUI
import Contacts
import Combine

struct EmbeddedContactPicker: UIViewControllerRepresentable {
    typealias UIViewControllerType = EmbeddedContactPickerViewController
    
    final class Coordinator: NSObject, EmbeddedContactPickerViewControllerDelegate {
        func embeddedContactPickerViewController(_ viewController: EmbeddedContactPickerViewController, didSelect contact: CNContact) {
            <#selected#>
        }
        
        func embeddedContactPickerViewControllerDidCancel(_ viewController: EmbeddedContactPickerViewController) {
            <#cancelled#>
        }
    }

    func makeCoordinator() -> Coordinator {
        return Coordinator()
    }

    func makeUIViewController(context: UIViewControllerRepresentableContext<EmbeddedContactPicker>) -> EmbeddedContactPicker.UIViewControllerType {
        let result = EmbeddedContactPicker.UIViewControllerType()
        result.delegate = context.coordinator
        return result
    }
    
    func updateUIViewController(_ uiViewController: EmbeddedContactPicker.UIViewControllerType, context: UIViewControllerRepresentableContext<EmbeddedContactPicker>) { }

}